This is Alton Brown's recipe for Gyros. If you scroll down you'll see his instructions for doing it rotisserie-style. I know al pastor is typically chunks of meat as opposed to a paste, but I wonder if this wouldn't be closer to the "original" al pastor that came to Mexico from the Middle East? Plus it's all done in a food processor, and I loves me some food processorin'.

If it's already ground and then formed into the shape, it should be pretty tender already, right? That's what I see with sausage if it's ground fine enough. Maybe with the larger chunks it isn't tender enough, and that's why they use the pineapple. Pure speculation.

* The more common and authentic method is to stack marinated slices of lean lamb meat onto a vertical skewer in the shape of an inverted cone. The meat is cooked by charcoal, wood, electric, or gas burners. The döner stack is topped with fat (mostly tail fat), that drips along the meat stack when heated. At times, tomatoes, and onions are placed at the top of the stack to also drip juices over the meat, keeping it moist. In Turkey, most restaurants prepare their doner early in the morning, and serve the last portion by the end of the afternoon. * In Western Europe and Canada, meat for döner kebab is often industrially processed from compressed ground meat (in essence, a form of meatloaf) containing a mixture of different meat kinds from various animals, making the specific contents less traceable. For that purpose, in Germany the amount of ground meat is not allowed to surpass 60% (Deutsches Lebensmittelbuch).

I think the processed stuff is a bit more ubiquitous at least for gyros. Stacking up all that meat on a skewer is labor intensive, whereas one can simply unwrap something like this in the morning:http://www.kronosproducts.com/p-meats1.html

It wouldn't surprise me one bit if there was something similar for Al Pastor.

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The first principle is that you must not fool yourself, and you are the easiest person to fool. -Richard P. Feynman